Clamp for crusher jaws



May 22,1941. J, mEM I 2,243,389

CLAMF FOR CRUSHER JAWS 3 Shets-Shect 1 Fild July 51, 1939 ZNVENTOR: M9 5? 44/6/44,

ay 27, 1941. J MCNEILL CLAMP FOR CRUSHER JAWS.

5 Sheets-Sheet 2 Fild July 31, 1939 INVENTOR. 0 0, AJ/CJQV44,

;1TTO EY May 27, 1941. J, MCNEXLL 2,243,389

CLAMP FOR CRUSHER JAWS Filed July 51, 1939 5 Sheets-Sheet 3 A RNX Patented May 27, 1941 UNITED STATES PATENT OFFICE 2,243,389 CLAllIP FOR CRUSHER JAWS Joe McNeill, Marion, N.

Machine Compan Application July 31,

The invention relates to rock crusher jaw re- It is therefore an object of my invention to present means whereby the face plates of rock panying drawings, wherein Figure 1 is a top view of a machine constructed in accordance with my invention.

Figure 2 is a side view thereof partly in section. Figure 3 is an end view of the machine. Figure 4 is a cross section of the machine. Figure 5 is an enlarged sectional view of one of the hold-down assemblies.

Figure 6 is a side view of a modified machine. Figure 7 is an end view of the modification. Figure 8 is a diagram showing temperatures,

on such plates whereby the 0., assignor to Marion y, Marion, N. C.

1939, Serial No. 287,651 4 Claims. (Q1. 113-99) lengths and separation of medial planes of weld and plate and radius of curvature required.

There is illustrated a machine comprising lower and upper identical frames l0 and H assembled $2 in mutually supporting relation, and being constructed from steel stock as two elements for convenience in production, particularly to facilitate welding of the joints. The upper frame will be described and the reference characters used with reference thereto applied to both. The

while the ends of these side beams are connected by transverse angle end bars 14, two being used at each end, one at the upper side and the other atvthe lower side of the frame. Between the beams beams l3, angle cross members l5 are fixed one at the top and one atthe lower side of the frame H, similar to the end beams I4, but shorter, so that they are fitted between the beams l2 for are extended flush with the outer sides of the All junctions of attachment indicated between members of fixed relation in the frames are welded. At each end of the frame ll there is ing to the horizontal flanges of the inner steel angle cross members l5. This completes the two frames.

The frames Ill and I I are held in vertical alinement by outer guide and seat standards l7, one

side beams I2, and cross beams I 3 thereadjacent, to fix their spacing.

Centrally located within the frames, thereis a vertical hydraulic ram 20, although other apl2 spaced immediately outwardly of the propriate pusher devices may be used, if found preferable. The cylinder 2| of this ram is set upon a case plate 22 beneath which there is located a foundation cross beam 23 connected by suitable hangers 24 with though other expedients for connecting the cylinder to the two frames may be substituted if desired. The saddle 25 of the hanger extends under the beam 23 at the same level as the feet 18.

The piston rod 2'6 of the ram is provided with a cap and cross beam '21 of a length equal to the width of the frames Ill and H and normally transverse to these frames. In the present instance, consequently, the beam 21 sets above the frame I I. There are provided two blocking or supporting cross bars 22, which are set movably ontop of the frame Ii as required, extending the full width of the frame, one at each end. At each end of the device a fulcrum block 29 is provided, one being set across each pair of anchor bars l6, each having a transverse rib 30 formed thereon, and resting at one end on this fulcrum there is a holddown or jaw lever 3|, the opposite end being a jaw 32, which is extended longitudinally inward for engagement over the end of a crusher plate 33 to be clamped, this plate being set on the blocking bars 23, as shown. The lever 3| is centrally formed with an enlarged eye or loop 34, and through this is engaged vertically a clamping bolt 35, set between the anchor barsof both frames I and i i, and having a head or nut 36 at the lower end resting against a washer 31 set against the lower edges of the anchor bars N3 of the lower frame, while on its upper end a nut 38 and washer are provided on top of the jaw lever 3|. Tightening of the nuts 38 effects clamping of the plate 33, by the jaw 32.

In Figures 6 and 7 the frame construction is modified to the extent that a top frame 40 is used, similar to the frame H for the most part, and the ram H is similarly set centrally beneath the frame Ail. Instead of the lower frame It, truss bars 39 and 39' are provided, extended diagonally upward from a base beam 23 similar to the one 23 and similarly located. The frame 40 differs in that two anchor beams 42 maincorporated in the frame as side members, one pair of these beams at each side, the two beams in each pair being spaced sufficiently to receive the anchor bolts 43 therebetween, which may be shorter than the bolts .35 before described but otherwise are similarly engagedwith the frame and with the hold-down device as first described, which is unchanged. This frame ,may, if .desired, include a number of shortlcngitudinal bars 44 inwardly of the bars 42 spaced transversely of the frame and secured to the transverse angles !4 and cross beam I3, which are incorporated in the samerelation on the frame 43 as on the frame H, except that the inner cross beams stop at the inner bars 42.

There are two truss bars 39 at each side of the frame and two truss bars 39. The former may be formed in one piece if desired, welded at its middle to the end of the cross beam 23', while its end portions are bent upwardly and welded to the outer sides of the outer bar 42.

The truss bars 39' may be similarly formed but are welded to a bed plate 45 set between the base of the cylinder of the ram and the beam 23'. The cross beams 23 and 23' may be formed of channel stock, if desired.

In the use of this invention it will be understood that its purpose is to establish a strain in the work whereby the latter will be held in a the top frame H, al-

definite shape while ribs are welded thereon and thereby counteract the permanent distortion of plates which occurs under ordinary welding operations.

Heretofore, in welding such plates, it has been attempted to weld the new ribs on starting with a cold plate. It will be appreciated that the crusher jaw face plates have a multiplicity of parallel ribs similar to the surface of the old fashioned washbo-ard. When it has heretofore been attempted to renew these ribs after they have worn away, electrical welding has been employed, using an applicator bar the fusing of 1 up stresses as it cools until at along the proper lines unites the fused material by progression of the weld forms ribs which as nearly as practicable approximate the original ribs. Such applied or built-up welded ribs have been found tobe very hard and serviceable but the irregular warping of the plates has prevented the successful continuance of the practice heretofore. In these prior attempts, operating on a cold plate held by ordinary work-holding devices, the plate becomes progressively hotter with each rib formed and when the plate has cooled, it is found curved out of proper shape, and this curving is irregular, there being an irregular distortion.

It will be appreciated that at the start of such prior operation the plate will be relatively cool, but the rib material and immediately adjacent portion of the plate will be fused at a high temperature. The added weld material and united part of the plate will be liquid, then plastic and will rapidly cool, and contract, but-will not set some"set temperature the material will have hardened sufficiently to retain strain due to its tendency to contract more than the plate increases due to its being cooled to a greater extent than the plate body, and stresses result which tend to bend the plate to a position different from that which it would assume if merely heated and cooled without the applied material. Attempts to heat the plate prior to the welding have not met with success since similar results follow, if in lesser degree.

It will be appreciated that the principal effective stresses causing the difficulties under the old practice are those stresses developed. longitudinally of the ribs, since transversely of the ribs the contractile effect of each rib is disas'sociated and disconnected from the similar effects of the next adjacent rib, and the slight local transverse stresses do not operate to materially affect the shape of the plate. The cumulative contractile action of the rib longitudinally, increasing with each unit of length, becomes a serious force acting on one side of the plate.

which on the work with the plate and Due to the fact'that the body of the plate becomes hotter with each rib applied, the relative difference in effect between the rib portions at one part of the plate and those at another later welded, make for great irregularity in the deformation. Also the time element involved in the welding technique of the welder, which is apt to be fast at one time and slower, at another time, have a material effect on the. nature of the distortion caused, it is thought. Whatever the causes, experience has demonstrated that the plate whether worked on cold orhot, and held by ordinary expedients, will usually be distorted so seriously as to be unfit for service in a crusher.

By'the use of my invention'it has been possible to hold the plate in a definite fixed shape while the welding of the ribs thereon is carried out, and also by one method to deform the plate in a direction the opposite of that in which the applied ribs tend to act when cooled so that when released the elastic recovery of the plate material and the contraction of the applied material coincide in efiect, with the result that the plate simply resumes its initial normal vform. The compensatory strain required may be mathematically calculated, as shown below. It must be arranged that the length of the added Weld material at this set temperature will be such that when its temperature falls to that of the main plate, the weld shall have contracted to equal the length of the plate, in which case the plate and weld will be flat and free of strain. Consequently, the of the plate must be lengthened relative to the body of the plate while the weld material is applied and returned to its normal unstrained position afterward.

This is accomplished by bowing the plate to an arc of a circle, according to the diagram of Figure 8, so that the length of the weld Lw is on a longer radius than the length of the plate Lp. The problem is to discover the required radius of ctuvature R, which will effect the required increase in length of the face of the plate.

Although a complex distribution of temperatures, and an unknown position of neutral planes will be encountered in practice, which might preby intricate mathematical The required increment in length of the weld at its set temperature which will permit it to shrink down to the length of the plate when temperatures are equalized is equal to:

where C is the coefiicient of expansion, and (TwTp) is the temperature diiference between weld and plate.

Then Lw, the required length of weld at its set temperature will be:

Referring to Figure 8 the angle subtended by the arc of the plate may be measured in radians, and termed A.

Then:

Where R. is the radius of curvature of the medial plane of the plate, and D is the distance therefrom to the medial plane of the weld.

Solving for R:

practice. The latter two factors are somewhat dependent, and it will be suiiicient to make a tabulation of the required radius of curvature for the several thicknesses of plates which will be handled- A suitable guage to measure the radius of curvature while the plate is in the press may be formed of a bar having fixed end projections or rests, and a central probe which actuates a dial calibrated to read the radiusof curvature directly when the bar guage is pressed against the lower side of the plate so that all three rests are in contact with the plate. If the plate is normally bowed, the guage should be zeroed against the unstressed plate.

To simplify the work for ordinary workmen, it may be determined by laboratory or other demonstration what definite hydrostatic pressure in the ram l 6 is required to hold a given plate in the desired form shown by an equation applied to the particular plate, and as there is a fixed standard for the material of such plates, and uniformity of size, it will be sufiicient to give a table of pressures to be applied to a definite range of plate sizes and materials. For a given plant this would be probably reduced to a single pressure suitable for the crusher face plates of the plant which it may be assumed will standardize on a single source of plate manufacture, and will have crushers with the same size plates throughout. In one standard facing plate a total pressure of tons approximately have been found necessary in the ram which would correspond to a guage pressure in the neighborhood of 5,000 pounds to the square inch, these readings being with instruments of ordinary use not ordinarily tested for accuracy, but indicating substantially high pressures required. The plate on which this pressure was used was one measuring 20 by 24 inches, and of an average thickness of 3% inches. The thickness on any normal transverse plane was uniform from one side to the other, except for the irregularities of the ribs.

It is an advantage of my invention that in cases where the ribs are worn more at one part than at another, and the build-up is required less at one part than at another, the compensatory eifect is properly manifest equally well as for plates which require thereplacement of the ribs throughout their length. The degree of heating of the plate in the welding operation has been found to be relatively unimportant at the temperatures encountered in such work.

I claim:

1. A machine of the character described conframe having at least two pairs bolt, a hold-down jaw loosely slidable on each bolt and having a recessed end to receive the fuland projecting oppositely from the bolt to engage over a piece of work, a cylinder having an axis normal to the said plane below the frame, a piston therein and a plate engaging member thereon arranged and consure to said cylinder.

2. The structure of claim 1 in which said top frame is duplicated therebelow, said bolts being engaged through both frames, said means to anchor the bolts being engaged with the under side of the lower frame, spacers between the outer parts of the frames, and both frames being connected to said cylinder. i

3.. A machine of the character described consisting of a bed element,,fulcrum blocks on the bed element, a jaw supported by each fulcrum and projecting inwardly over the bed'element, transverse supports on the bed element positioned to lie beneath respective end portions of a plate and spaced inwardly of theprojecting portion of the jaws, means between each fulcrum and transverse supports for forcibly drawing and holding the projecting portion of the jaws intov engage therethrough, a bolt carried by the bed element and positioned outwardly of the work and extended through the opening, said jaw further having a groove to receive. the fulcrum therein, and a nut on the bolt to hold-the jaw down.

. JOE McNEILL. 

